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Re: New Phone Battery Arrived at 2.68 Volts

2.68v isn't too low to the point where the cell is unusable. However if it sat at that SOC for a while, there could be some permanent damage / capacity loss.

I would probably contact the vendor and see if you can exchange / return it. But I don't think it would be at all dangerous to try using it either. Just keep in mind it won't likely have full capacity like a fresh cell would.

Re: New Phone Battery Arrived at 2.68 Volts

That is strange, 2.68V is not so low. Anyway try to recharge it externally.
Also this low voltage can be one of the signs of damaged battery - it can have high internal resistance etc. So try charging it externally above 3V and see if it helps.